3 input_opts, 4 relationship between the main inputs and pv, 3 computation section – Yokogawa YVP110 User Manual

Page 102: 1 computing equations, Input_opts -3, Relationship between the main inputs and pv -3, Computation section -3 18.3.1, Computing equations -3

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<18. AR Function Block>

18-3

IM 21B04C01-01E

18.2.3 INPUT_OPTS

INPUT_OPTS has an option that handles an input

with “uncertain” or “bad” status as a “good” status

input.

Bit

Function

0

Handles IN as a “good” status input if its status

is “uncertain.”

1

Handles IN_LO as a “good” status input if its

status is “uncertain.”

2

Handles IN_1 as a “good” status input if its

status is “uncertain.”

3

Handles IN_1 as a “good” status input if its

status is “bad.”

4

Handles IN_2 as a “good” status input if its

status is “uncertain.”

5

Handles IN_2 as a “good” status input if its

status is “bad.”

6

Handles IN_3 as a “good” status input if its

status is “uncertain.”

7

Handles IN_3 as a “good” status input if its

status is “bad.”

8 to 15 Reserved

There are options called “IN Use uncertain” and

“IN_LO Use uncertain” for the IN and IN_LO inputs.

When these options are valid, IN and IN_LO are

internally interpreted as “good” IN and IN_LO even

if their statuses are “uncertain.” (There is no option

for “bad” status.)
For the IN_1, IN_2, and IN_3 auxiliary inputs, there

are options known as “IN_i Use uncertain” and “IN_i

Use bad.” If these options are valid, an IN_i with

“uncertain” or “bad” status is internally interpreted

as a “good” IN_i.
* The exception is that if the input status is “Bad.

Not Connected,” INPUT_OPTS does not apply and

the input is considered “bad” as is.

18.2.4 Relationship between the Main

Inputs and PV

The value and PV status are determined by the

statuses of two main inputs, INPUT_OPTS, and

RANGE_LO and RANGE_HI.

• If the statuses of two main inputs are both

“good” or anything other than “good”

See 18.2.1, Main Inputs.

• If only one of two main inputs has “good” status

after application of INPUT_OPTS, the PV value

is determined as follows:

• If the status of IN is “good” and that of

“IN_LO” is anything other than “good”

IN > RANGE_LO

→ PV = IN

IN ≤ RANGE_LO

→ See 18.2.1.

• If the status of IN is anything other than

“good” and that of “IN_LO” is “good”

IN_LO < RANGE_HI

→ PV = IN_LO

IN_LO ≥ RANGE_H

→ See 18.2.1.

RANGE_LO

RANGE_HI

PV = IN_LO

PV = IN

PV = g × IN + (1-g) × IN_LO

PV = g × IN + (1-g) × IN_LO

IN

IN_LO

F1803.ai

If the status of IN is “good” and that of “IN_LO” is

anything other than “good”

If the status of IN is anything other than “good”

and that of “IN_LO” is “good”

18.3 Computation Section

18.3.1 Computing Equations

This subsection shows computing equations used

in the computation section:
1) Flow compensation (linear)

func = PV × f

f = (t_1 / t_2)

2) Flow compensation (square root)

func = PV × f

f = sqrt(t_1 / t_2 / t_3)

3) Flow compensation (approximate expression)

func = PV × f

f = sqrt(t_1 × t_2 × t_3 × t_3)

4) Quantity of heat calculation

func = PV × f

f = (t_1 - t_2)

5) Multiplication and division

func = PV × f

f = ((t_1 / t_2) + t_3)

6) Average calculation

func = (PV + t_1 + t_2 + t_3) / N

where N: number of inputs

7) Summation

func = PV + t_1 + t_2 + t_3

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